Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a03dfb71a868d1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 06:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7b3ca7d2e411146d39bf96d871c49220 SHA-1: 42615fd1b0c3b7adbf93f28ec67943a7349b43d6 SHA-256: 31a03dfb71a868d1acddf502765507b0a4caf98479a317ebea0533c824be9a65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=hyperlinks+in+pdf+from+word+not+working PDF link annotation
    • http://medtravel.pro/images/hand_uploaded/files/82822959342.pdfIn PDF document text
    • http://santeh.md/img/files/46464266502.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec428257b25---dasizonasek.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7ea5afc40176e29e20edf0341adfa22b/tutapodekeropuzodujemelip.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a8f253abd3147da0bdd4e50dbf19844e/84860907283.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839f399e5c3---1858366958.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/33243750307.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/fbu44emumd1p0i9q0320qpp9jg/5730430939.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210616_51846DC61C504A81.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/molorudokawinalixilowapiw.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/86099791577.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/38052901044.pdfIn PDF document text
    • https://brs.jo/userfiles/files/xeropex.pdfIn PDF document text
    • http://geose.ru/userfiles/file/vomev.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607987b9260c3---dagatenojaxevibibulawas.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdda421c13---25488299159.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/521db3627cdd2f05b562e056d73eaf0a/mupemikirerixivagajewiz.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/57935931241.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/87276510819.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/letedivu.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/90194238282.pdfIn PDF document text
    • http://cartopack.com/Images/file/38826018886.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/suzuvidanorozividuzafe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 17444 bytes
SHA-256: fd33fab275639d750d7c5e5eb2ac90347b2cd40bc335f9bc59f6e9a97c56537e
font_01_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 10960 bytes
SHA-256: 9717400292c1be03cbeba2327bcaf7cbdf05b00328f5ffb9fcb79268a6787da3
font_02_sfnt_off00012304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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